Tim Cook reveals what he does at 4 a.m. every day — It has nothing to do with sleep

Tim Cook is worth at least $625.37 million, according to a 2017 estimate by data company Equilar reported by Time.

Source: TIME

The bulk of that is from his total stock options and shares in Apple, which total nearly $622 million. Cook is also on the Nike board of directors, where he has $3.4 million in stock options.

Source: TIME

Cook's actual net worth is certainly even higher than that — but information on his property, investment portfolio, and cash on hand isn't publicly available.

Source: TIME

That's relatively low compared to other tech CEOs. Jeff Bezos, Bill Gates, Mark Zuckerberg, and Larry Page are all worth tens of billions. 

Source: Forbes

Even though Apple is the highest-value company on the planet, there's only one known Apple-related billionaire: Laurene Powell Jobs, who is Apple cofounder Steve Jobs' widow.

Source: Forbes

In 2017, Cook's salary as CEO was $3 million. That's up from his first year as CEO in 2011, when his salary was $900,000.

Sources: Apple regulatory filings from 2018 and 2012

Cook, who came out as gay in 2014, is not married and has no children. He leads a private, solitary life, but here's what we know about how he spends his fortune...

Despite being a multi-millionaire, Cook is remarkably frugal. He reportedly buys his underwear at Nordstrom's semi-annual sale.

Source: Mashable

"I like to be reminded of where I came from, and putting myself in modest surroundings helps me do that," Cook said. "Money is not a motivator for me."

Source: Inside Apple excerpt by Adam Lashinsky

As of 2012, Cook lives in a $1.9 million Palo Alto home that's 2,400 square feet. That's relatively modest for the ritzy Bay Area city, which now has a median home value of $3.3 million.

Sources: Cult of Mac, Fortune, Zillow

Cook spends most of his time at the office — which includes reportedly waking up at 3:45 a.m. to start reading and responding to emails.

Source: Business Insider

As for travel, Cook has to travel often for work. Apple spent $93,109 last year on Cook's private plane alone.

Source: Apple regulatory filing from 2018

But he keeps it domestic when it comes to personal travel, visiting spots like Yosemite National Park.

Source: TIME

One of his known vacations was to New York City with his nephew. He showed the tween boy around the New York Stock Exchange in 2016.

Source: CNBC

Indeed, Cook's most-known hobby is his love of fitness, hiking, and cycling.

Source: TIME

Cook goes to the gym at 5 a.m. every morning — but not the Apple company gym, so he can keep a low profile.

Sources: Mashable, Business Insider

But we do know that Cook likes to spend money on political causes. He's thrown fundraisers for politicians like Barack Obama and Hillary Clinton.

Source: Fortune, NPR

And Cook plans to give away all of his money to charity when he dies. He has no children of his own, and wants to create a better world for his nephew. "You want to be the pebble in the pond that creates the ripple for change," he told Fortune in 2015.